although the nptc ticket tends to be more influencail, the rules are you should have a certificate of competance. it dont matter whos name is on it (lantra, nptc, in-house)

in the past, the two were seperate courses.
nowadays, lantra does a course, nptc does the assessment of that course.
with lantra, chaps are trained, then given a certif, this usualy expires after five years, which encourages updates, which can be very handy.
as nptc is just an assessment, you either pass or fail, its not hard to pass if youv been using the kit relativly safely, i passed mine easily without anyprobs, and without the lantra training.